Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Other Income and Expenses [Abstract]
Interest income	$ 0.1	$ 0.2	$ 0.2	$ 0.3
Net foreign exchange gain (loss)	(2.0)	1.0	(3.7)	0.1
Other			(0.1)	0.1
Total other income (expense) - net	$ (1.9)	$ 1.2	$ (3.6)	$ 0.5